Downlink multiple-input, multiple-output coordination

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control signal indicating a scale factor for a channel state information (CSI) parameter. The scale factor may correspond to a CSI reference signal (CSI-RS) measurement and a second measurement. The UE may receive a CSI-RS, and a value of the CSI parameter may be based on the CSI-RS. The UE may transmit a CSI report indicating an adjusted value of the CSI parameter in accordance with the scale factor. In some examples, the scale factor may be associated with a downlink shared channel block error rate, a demodulation reference signal measurement, an uplink sounding reference signal, or any combination thereof.

What is claimed is: 
     
         1 . A user equipment (UE), comprising:
 one or more memories storing processor-executable code; and   one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the UE to:
 receive a control signal indicating a scale factor for a channel state information parameter, the scale factor corresponding to a channel state information reference signal measurement; 
 receive a channel state information reference signal, a value of the channel state information parameter being based at least in part on the channel state information reference signal; and 
 transmit a channel state information report indicating an adjusted value of the channel state information parameter in accordance with the scale factor. 
   
     
     
         2 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive a downlink shared channel transmission, wherein the adjusted value of the channel state information parameter is based at least in part on a physical downlink shared channel block error rate for the downlink shared channel transmission and the scale factor.   
     
     
         3 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive a downlink shared channel transmission, wherein the adjusted value of the channel state information parameter is based at least in part on a demodulation reference signal signal-to-noise ratio for the downlink shared channel transmission and the scale factor.   
     
     
         4 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmitting an uplink sounding reference signal, wherein the adjusted value of the channel state information parameter is based at least in part on the uplink sounding reference signal and the scale factor.   
     
     
         5 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive a downlink shared channel transmission, wherein the adjusted value of the channel state information parameter is based at least in part on a spectrum efficiency for the downlink shared channel transmission and the scale factor.   
     
     
         6 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit a message indicating a capability of the UE to adjust the value of the channel state information parameter according to the scale factor, wherein the control signal is received based at least in part on the capability of the UE.   
     
     
         7 . The UE of  claim 1 , wherein the adjusted value of the channel state information parameter is only based on the channel state information reference signal according to the scale factor. 
     
     
         8 . The UE of  claim 1 , wherein the control signal indicates a plurality of scale factors including at least a first scale factor corresponding to the channel state information reference signal measurement and a second scale factor corresponding to a second metric from a sounding reference signal, a physical downlink shared channel block error rate, a demodulation reference signal signal-to-noise ratio, a physical downlink shared channel spectrum efficiency, or any combination thereof, and the first scale factor and the second scale factor indicate a weighting value for the channel state information reference signal measurement and the second metric. 
     
     
         9 . The UE of  claim 1 , wherein the channel state information parameter comprises a channel quality indicator or a rank indicator. 
     
     
         10 . The UE of  claim 9 , wherein the control signal indicates a first scale factor for the channel quality indicator and a second scale factor for the rank indicator. 
     
     
         11 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive a second control signal indicating a second scale factor for the channel state information parameter in response to the channel state information report.   
     
     
         12 . The UE of  claim 11 , wherein the control signal or the second control signal, or both, are transmitted via a medium access control element or downlink control information, or both. 
     
     
         13 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 adjust the scale factor for the channel state information parameter based at least in part on a radiofrequency condition, mobility of the UE, an application Quality of Service (QoS) requirement, or any combination thereof.   
     
     
         14 . The UE of  claim 1 , wherein the scale factor is associated with an uplink sounding reference signal, a physical downlink shared channel block error rate, a physical downlink shared channel demodulation reference signal signal-to-noise ratio, a physical downlink shared channel spectrum efficiency, or any combination thereof. 
     
     
         15 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive a second control signal indicating a further adjusted channel state information parameter in response to the channel state information report.   
     
     
         16 . A method for wireless communications at a user equipment (UE), comprising:
 receiving a control signal indicating a scale factor for a channel state information parameter, the scale factor corresponding to a channel state information reference signal measurement;   receiving a channel state information reference signal, a value of the channel state information parameter being based at least in part on the channel state information reference signal; and   transmitting a channel state information report indicating an adjusted value of the channel state information parameter in accordance with the scale factor.   
     
     
         17 . The method of  claim 16 , further comprising:
 receiving a downlink shared channel transmission, wherein the adjusted value of the channel state information parameter is based at least in part on a physical downlink shared channel block error rate for the downlink shared channel transmission and the scale factor.   
     
     
         18 . The method of  claim 16 , further comprising:
 receiving a downlink shared channel transmission, wherein the adjusted value of the channel state information parameter is based at least in part on a demodulation reference signal signal-to-noise ratio for the downlink shared channel transmission and the scale factor.   
     
     
         19 . The method of  claim 16 , further comprising:
 transmitting a message indicating a capability of the UE to adjust the value of the channel state information parameter according to the scale factor, wherein the control signal is received based at least in part on the capability of the UE.   
     
     
         20 . A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to:
 receive a control signal indicating a scale factor for a channel state information parameter, the scale factor corresponding to a channel state information reference signal measurement;   receive a channel state information reference signal, a value of the channel state information parameter being based at least in part on the channel state information reference signal; and   transmit a channel state information report indicating an adjusted value of the channel state information parameter in accordance with the scale factor.